Dear Don, I have a 450 G4, sawtooth, and am using the iMate with the LA dongle on the 2nd USB port in the back of the computer. I have my keyboard running from the first USB and a Macally 7 port hub running from the keyboard USB with no problems, though I haven't tried syncing up to timecode because I can't use my serial port MTP II. I have ordered a Unitor 8 USB and am waiting for it. I don't want to use FreeMidi or OMS and have decided to buy the Unitor with the hopes that I will have a stable sync system. I don't know if this is of any help, but voila! Judith yiti@...